SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3075dc2322727a4d05daabac6a3e63c9a3eebcd9674564a03ec8a4c32c9024fb' 
  AND token = '1Ypl5+f62pCZAW+mzU/Nj1xQ4MKJreqwgByYZtLdYQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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