SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613377b686a12295ff0cfaafc7f121b2dcfa383e8df787b10047a72ce1bb6837' 
  AND token = 'nhVA0Z6NHVl/acI+9vuxqJHGs3/nyX+1j9nkKATdSjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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