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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7af69c292d88fcdbca4092129dcdd846f2a88553c11c119c464dca046f639f' 
  AND token = 'R8PU5fKZ9MP3I7ZX3z15B9npiiWEBUw1FRF3OYzK2V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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