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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb320c93cee5a9f702c3b79a5ec2840a1344df9e9c258ff0d53a6c85e41ced3' 
  AND token = 'roWqhT3MNBQa1/DC0cTRj776WxDGH2pjd9fOu/udCsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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