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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4cc3d30e706d6ad0cb324ec7114addc641b8d0eb2384930cd3de7f96a73e71' 
  AND token = 'IfVweFTTD5IAhmn+o+OE06AFSBbP0XckRvUq2pUigA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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