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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e314218efd45f1f8948d925ba67c539d67f34c6e36ecce727c027a205a0432' 
  AND token = 'lcuTiwnjhpOMi0ch1GwH9J6t9ZWtJTV9duvXTE9LflY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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