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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbaf290bf59e145f85829fafa1e13bf066c86a7bbbe6319036d8f29dd89ff77' 
  AND token = '67jGI8fwxlTHnETyC0fOugP8tOSX/OV1cDgzhB+ikII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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