SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed3f4ab422161898db88543683f0e8d9ddf1b475e6785afee6b660585a1aa3cd' 
  AND token = 'Jzuc4/2GWd0BA+XW+qesU4wdLVrj2IcQfghiJ+IIsdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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