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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a5df3e9b587a55fdf0463978346f1863ae74fd489a235c7c773e5a538fbf39' 
  AND token = '4XgpvJkMJoLN5Z2cWbLg21vCJLQ7NU/kpt7QM7VMOoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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