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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ef0c52a2f9d41bc539959e22c594805bc5ea4dbd8cb245d9b449eb3c7ae894' 
  AND token = 'o2gKg5PMoZvzMlwUgJKDCbjoNVvSDMEUrohXgltV418=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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