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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6057d11a05751830023d6cff109f20e5dd217db4b2986a61eafb61c7c58143' 
  AND token = 'lo6hZv750vSJFpTMD1cQ3jcBJwI8++deUqjSxW0li+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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