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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcbaeb423d565178326c5319205d1a4fa4d92eef98816f1d6ca5f0d1d7eea0d' 
  AND token = '+RJ5WT3Ekh5JU81X026OTiBiiVPKfkXQjTNzVbjGfac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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