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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a54a0f383af6bedcee55070cde4e38928f9f1ddde63ffe7c2f40f44240139de' 
  AND token = 'l6L5K5dAn7ncJ4CFUDG0lMChZVReSJCj/eDNp2C9Bew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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