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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093c070176de3eb85a80ef4c1f7e02422e6fed4260f795fe0151bda0c53e5826' 
  AND token = 'm1tSxiKFvDPLoylWE2FPL9Sb1Ez4M8lGVLRpppIpII0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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