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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15622298573440e8912b439b9f5a2802b027379a9095582be632ab66e4f7519e' 
  AND token = 's82W6moTdWSOrMOJOhKyCtzrdfQx3bVqqq80hR3bFGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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