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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c945362b88cc720b134c572b8ed08e61c79c16c5b82791418aa5516164d8324' 
  AND token = 'G/fonSWgwd9/p98ZTQB+8JsBztyxCrOLi3OZTTsP9OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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