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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1358f39a4d18559d396c24ef4ffae78ff3e1d137a8e829a19cbd726c59c3fe85' 
  AND token = '8uyv0/smENaxSixJhMlxx5G3xgRBf6KfR2G6KTfPck8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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