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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ec91ddd9edf010cf1d2a64c441050c743b70af27955edea3362368752b355b' 
  AND token = 'MLhSzAlIF/1XH9iQgZp7KSJqBIDM3bLACkiJVT0koMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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