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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199240cb2d7c3ecc64efe40fb878766de806e36a492daea2b5b1cdcf4bbe427e' 
  AND token = 'b4Wd+h176lSSdUyER/h1KvjdRRkYbt9yTJjP8t794Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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