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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2036211fd310a6266b8fe6df06083e210d829aa3ed9832b7995dd645d88e45e8' 
  AND token = '3q2WQtgLrSv5+FutrfjZx/l2hcSDfPfUXeZWDs93mXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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