SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ddf91b1b1cb7d06e6153ab177c246df8a74f3afb2c7e9034dc703392fa6def4' 
  AND token = 'JGAIgJFhQKiKqEX74GTmGk+7vB/spGGyLfRkI4ktUpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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