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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d272c752e07d740b790fd15d9cc9800e34ca17a56cf4d6a575535d04223c25' 
  AND token = 'wGwRDfaiJdddgexIfWr0GgNgiK56Oz57NwZZww8FAtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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