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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9c3aaa3292a3eff9c566eeb6a3c02eed53469f5b4142fa7710d7b4ae1de461' 
  AND token = 'u0QTr7GI0k41T7uuibYOb0TK5Q9GpJ9/lMncuF1J8Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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