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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff6070e60191258e0c583d980b659c9ebb31482e0c4ceaf4e1e7e97fd7c64fe' 
  AND token = 'oL5+ilBhNZUJiG42Er6Na7IRruL6SrnKDZ9McEhua38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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