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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9be47e4a6c303fcf961f0248ee3f756edfc3b334162dc293b7e700bbbbef67d' 
  AND token = '9TmX9wZOw1JT04fezd3EAs/6WCewhJMGrZoaGe2pXPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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