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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ab0ba9a0f5433a909c1ca273a86e85b182dc0795de4d8c0ea101a38ce3b7c7' 
  AND token = 'yc2UtO1kppJ09VX8hGw7lI78rt6ozIA2K5kr9iqJ48k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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