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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be54dcb8186759a3ab599bebbdd2f821868dec1a6e6d4669151ed1a2fe29918' 
  AND token = '2u3QVIh5/xTnu5ob2jNknqRKBQQLfYHUcJi4zbtxRDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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