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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4773dcb83e598a4d06c3c665a78ecf1242a0a8dcd4cbcc78ffcfeaa926e11d84' 
  AND token = 't3TizqHaAYa1O+qj21LW+sPN64dIlwyXBuKQcFwQyAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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