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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6652fb89022e75ed6c9431aae3ce90b0eff219b86c458ff44e95a99e2a060b4' 
  AND token = 'WO+qBEJ6vCQZ3vwSXm58CaQ+P+sabnv7b/dUP9pHkG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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