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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb53131bc057368936046771e6de2a410933458c280c3d1c59689445393cde5' 
  AND token = 'KuxOvuxs165SP0Q0YgAoBfwDJqBcq6HisaToD5et5Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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