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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaaaf417d4de61a677b5e480dc680c2f0a4f10c8ed372bad7c34de12e65891db' 
  AND token = 'qiSc5whEtY6Tv2zk2DvRDNQmehLw0BSdcfTJNzIYKZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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