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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9960bbd4dce87e94655aa01af5a4c89b42cfd2a1c18ee3d42d9f09e843c60f9' 
  AND token = 'LRsnDpzOVVA/e7NfBSDcTTZBg2naAOEGEHRzLmAJKIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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