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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513dbe29b4cdd11f238729178c12b50e0d6a16912b669922efce981ad8ebe770' 
  AND token = 'cn28AR2C4KCy+ewksRY+reB8KW/Hame3apD8M+iKUgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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