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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee908a519c04ac157682588b67484a8edfc723ebea7beb4f092f831cad59ebe6' 
  AND token = 'sX7o1BNk9tuHucJfU9LzbPqe/RfD9scZK6qeYyI1UQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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