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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3afe7169e3aa244deb9169c3010b9026091b31a41fc5e6a1b7f4eaa87e0a44c5' 
  AND token = 'ymotMX6vutJk82kwKTyF72ASbn+TLZvel/MDQqe4Rqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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