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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da14c8b518ab87b54c418f6bc50def531934d83e8fc45641233fffa0e7e0a00' 
  AND token = 'sbQxKrVdIufq8hIqWd0ji2+h3IhZ///Ki6xH+MpJ6nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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