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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409df2a7f608bf4db601a686532bf8bf8f89dfb12682119cd70f815c1efb6ea2' 
  AND token = 'fgDDsrx/0CE8KXkFXndejnhZN/NR2BNLrJKu0iUsing=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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