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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986ae5fde5537c22ee7269b04ae0c7bbcf1861564e5b5e4f2488b4f77bd046cf' 
  AND token = '1nLr3QC4J8nfvhEpQ5Wu5JZxd/ITPLm/e9Q8Ff0j7fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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