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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a51ab69265ba26fd25dfb69ab07d468ae4622328ef94238ebc6f3d60c0d5f8c' 
  AND token = 'na2NXP5wrvNd97qGHOpfSn7aVtHXbkKsWljuj1Xvd2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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