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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eec9bf6f690e894f79308ec7213868181ab5eddf9771f90da8a742f71721108' 
  AND token = 'NerzRZN7PsrVjyjO8+dvg+Yzpwnmok+s7EQrfIXckX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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