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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41232a96e89faa43abc547955869953a646e949c39152028b74281d9b246c290' 
  AND token = 'NurKhl4Gi4Kpd+Bd+/c++5qWJIfxa2vJ3LGMTtdprkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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