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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a0a0bdf99b7f853f7ff87ecbd03930798c1301419a13c962ad66d4c6cf8abe' 
  AND token = 't8ipjlkA+vwmiJdAtjkd0KALa2udyQz4B4qyWQDylYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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