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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bbcb707eca2ef3bfdc1e21aa6a591338cd29f56bf991bb737359e31a4d15eb' 
  AND token = 'pjQKhYxhLhNZ/zkUE6Ac83P4PqCa5rptq5FRewFHum8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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