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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d2f9286b189eee65d37c9882702a1a4b764da49bbd9b1561fb825d4a20aaa9' 
  AND token = 'dVgAms8Jx/ddeIc3UoESmaPIp3HByQX6oqSiR+lABWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}