Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493f9dec751a7153b1de668284d5a6fb29938b9e8e1797dbc64117fcabfc2697' 
  AND token = 'uTHmHscZhru99kWkjGn1uJvQUB6PBujklflWYljMCAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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