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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc14a8c5fc45058e97493be3fb57dcff00f69d98f57ac1ede2ad68e9952f85a9' 
  AND token = 'xCUmeLynocpKM5e5hRErNbUUI0zvgS99tP7leFM20Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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