SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e95df6c23839c6717665c686a264307e22b8286d54a40bd81f6204fd9d010ff' 
  AND token = '+pzxQJjl5CPmSB78MWULkhjjBS3I3iIztXsgD/5Ij/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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