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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305017d5606c04a9a864e736ee69489343773a88d6bf0166cc34b46918093463' 
  AND token = '0qI8mJpVR5FTXMnAa5jZ8up4yt2zUycENYHnxrs0Guo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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