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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbab7159667c0a743f402c8c40090eeb924f0bcbf5c0b664e3afdd87717a666f' 
  AND token = 'BKQ6F68/FlhS361Xrj6/xKQ0pJxuLuF/9pDHE2J6Lpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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