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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38e480218e8bb6553285b0ab15965f378cfc8eee3b83a5a4479ef3fedb0c3de' 
  AND token = 'eecLDP9XfGCyDhRqgHGTICEzeFdEn0tNnrEVOcxjMrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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