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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9090427c51cf25a6b7fde1c5e1b9779fe0bc9c842c85fffde31be701adfb7fb1' 
  AND token = 'oxZCAZRnkaeKa3OH4m3H4fSviWvrOCIBD8kN9hUSY1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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