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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7ec7bf9b9c7e243245be80ebdb8332c1dc797c61aa907dd49122d4fa76a3ec' 
  AND token = 'Kwz32xde1Dw+3zsBBkqUn28K5EOdzFrqKfrAEWIvs20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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