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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d040da77d742857345efa2200b4cf3baa32565e96845ccd6d4d00c68dbfbca' 
  AND token = '5MzgN65+ha9wdBytYSLZBI42udpYMoCL+PMq1h3r/pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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