SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acaec4fa426e8dbf0d6fa20ad08ccbaf3dd9ebca337ac6ad136830242313722' 
  AND token = 'OGFofsWi0fxdfoJeP113PvUpx2ahGuyDRkxnXjRkPs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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