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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4b432d33ac689ccec4e424a85f7457fa031a5c8a3e69a87732c9ae854816da' 
  AND token = 'hGYkuVnuXzyYbx0TDj40NJPU++wxeX7nVNZPW0DhjgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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