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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee33440f9817092ae68f152af1692b5cf3d1577292acf02e6eb7c0bb16228e3b' 
  AND token = 'RO/Ur5o2sbQxf9gEp1gB3Yl3pzq5Hwia5RhHClCHkb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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