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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4aea58d649f19950e21ccc836c7bbe1fee8ada8164994ab28ed90a7ad45bdbc' 
  AND token = 'cEu3LqoLY3We/yH9cbBz29WxhEEXB6teCg6sbevmFP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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