SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ac9bd53f3a06418fd825bdf251808be0b88ff7e1f7a47e9f5ba6878d1a150c' 
  AND token = 'ge5WomX+/ViKUqGhnynJlG4hS3JYpHsPym/1gaEK/MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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