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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4edb6f150acadb1ef5a451b581e93e9ab6eaca50b0bc9d978b5ac7f63ee93c' 
  AND token = '/kYnHM5jw7Fj/J9mLBfaC+m1Hzh9oLwgY4Kxd16q9rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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