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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f720b1da2ef0980ff643b7d75f91e0232b0c744dd1c7df741dd151eb524dbd' 
  AND token = 'RUhYPZ0z2jxBkxW7bdRusNOGJmE/tjNhoE0nQ2j7QJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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