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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd98a7488412bb4bfd467fdf7364b228bbb5e7610e474a7ad16e65fe56f3efba' 
  AND token = 'AganNWU6CtL3k5q5cMeKgxdxwiVwL2h7mjJONOX+NXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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