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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb63e1a12d140bb0ee6f23daf1b57c1c2b7926d6db1f5a8ff68518afc333b6de' 
  AND token = 'IR9ctaw/Y0ZCjJiNecNQtXlrMQY49cKVohotGjbQEYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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