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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733e4dda46e5958b6497ff3ce811dcbe19cc117bf22615217f0c31cb5eae8d6b' 
  AND token = 'ZTiW5XhUIuIxfm95EgO6bdQ9g0Hgdsj7RfnpB6Rmzbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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