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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd53ae2e00d664abc5971b9dcb9929a4017859a7b973c727022bc9c04ae8b97b' 
  AND token = '5Jehtq1SXr/Gvbfo/lWLiPM+xVQueOtBFkamRxltOwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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