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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1c555241c39c380cc638e7f9e3644c028e954f50765c879ee100334c256fa0' 
  AND token = 'gPWCrJjiNA8JmP+nifF9Xe5ypyk2KB/rS87zc5sFEYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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