SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c0094cbd371c6b635410af0a03326a01e4e6e39f1750735246fa89f90a770d' 
  AND token = 'SbhTal4Uc4BVEhjwHTPITbrVggJswqRVJTJOzxlLjBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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