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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8011d29b68ad126e46b51cb3899459accf48b9783d7b06ed49899ef3fbecf7' 
  AND token = 'nbtrI8QZHeX1W4zCb3uGP+/IhVP8V0ERzaD9Ro360UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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