SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3acd68bffc1f9e5591b4844d52990060b9b80afcff7427626fb664334813a86b' 
  AND token = 'hZ/KUWEZ1jWB9BsC+84vcxcyNomrP/rMgsX9X7tBSgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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