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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05829e1ca254c9cd53202a4e8f16b339f86a0e73b147bd8fa15eae99244e8b39' 
  AND token = '8dy1CvBCf2WCcIbpJtI5UMlFjS+YnMhb+ICDXyxhDuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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