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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f9251e49b787f5885d5527dd0678c79d681dc528864aa4f46a4e9ef19f3068' 
  AND token = 'YuW4x3dgplZDwGsOP6W3K4Ry8vIVk25LV/tZnO8pNNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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