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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050a9ded3ccae4066d08f2fe27ec02f3ccc88d80a511e2954fa7809e1e9e8273' 
  AND token = 'rq3sgP7gw/IK87cz1rofv/XWTFbWnbnXNyAS5LhSzF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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