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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55be3c5574a4e9ca80bc5bc28dc65ef9f893af4f4935cc97dfff0a83d595735' 
  AND token = 'ZzqyXaHdPfdglV3CvJvRCt1JF87Cf0DX+cr+8RM/N4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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