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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ceba43d8e42044df453eaa48b7ba301aa5d2060a9cc70ea1cb7f0eff3f7100' 
  AND token = 'XNMmEkzEUA7TgMm6UD/4PM7XTeeQoq1IeJq8cG7tXs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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